Adjustable mounting for stationary knives of cutting machines



P. S. MITTS AND W. J. WINSTON.

ADJUSTABLE MOUNTING FOR STATIONARY KNIVES 0F CUTTING MACHINES.

APPLICATION FILED JAN-9,1922.

Patented Oct. 3, 1922.

III!

IH Ill /MNVENTOR$ ATTORNE Y Patented Oct. 3, 1922..

v reo stares PHILIP S. MITIS AND WILLIAM J.

wrnsron, or saenvew,

MICHIGAN, ASSIGNORS T0 MITTS & MERRILL,-

SAGINAW, IVIIGHIGAN, A CORPORATION OF MICHIGAN.

ADJUSTABLE MOUNTING FOB STATIONARY KNIVES 013 Application filed January9, 1922.

justable mounting for the stationary knives of cutting and shreddingmachines, and pertains more particularly to a knife adjustment forcutting machines of the kind which comprises a casing having acylindrical drum revolvable within the casing and cutters or knivesarranged around the periphery of the drum and carried thereby. Suchcutting machines also usually have stationary or anvil knives mounted inthe ,casingand arranged in parallel relation to the drum rim and spacedapart around the lower periphery of the drum.

Cutting machines of this type usually have the casing provided with aninlet hopper at one side of the drum axis and an outlet spout at theother side.

In operation, material to be shredded or cut into granular form is fedinto the inlet hopper, and under the combined action of the rapidlyrevolving drum and of the successive stationary knives, the material iscut and recut while passing from the inlet hopper to the outlet spout,whence it is d1scharged as granulated or shredded material.

In cutting machines of the character above described it is essential foraccurate and uniform cutting that the stationary knives be maintained inproper adjusted relatlon to the cutting edges of the knives on therevolvingdrum; that is to say, there must be no yield or movement of thestationary knives, and their working edgesmust be so gauged withrelation to the knives on the drum that the stationary knives can berestored to their proper cutting position after having been taken outfor sharpeningor dressing without danger of disturblng the properalignment of the cutting edges of the stationary knives with respect tothe cuttlng edges of the revolving knives. Furtherprovide means, easilyaccessible CUTTING MACHINES.

Serial No. 527,948.

more, it is essential that and clamping means shall the stationaryknives, to prevent movement or chattering, and it is also desirable thatthe arrangement of the stationary knives with respect to the casingshall be such that the knives can be easily and quickly removed from thecasing, dressed or repaired and'replaced in the casing with a minimum oflabor and without resort to accurate gauging or measuring methods.

proper adjusting be provided for In cutting machines of the kind. towhich our-present improvement is particularlyintended to be applied, theknives have-usually been mounted in the casing, and the casing, or thatpart of it in which the stationary knives are mounted, has been maderemovable so as to gain access to the knives for replacement and repair.

ur present improvement has for its object to provide means whereby theknife will be accurately gauged and held with its cutting edge 1n properrelation to the cutting edges of the revolving drum knives, also to fromout side the casing and at the ends thereof, whereby to clamp thestationary knives in their said adjusted positions.

A still further object is to provide a mounting for the stationaryknives, comprising endwise clamping devices that rigidly 'hold the knifeagainst longitudinal movement and yet permit the knife to be easily andquickly removed from the machine, not by a removal of part of the casinas heretofore, but by withdrawing the kni e from the end of the casing,the knife being drawn out longitudinally.

With the foregoing and certain other objects in view, which will appearlater in the specificationJour improvement consists in the devicesdescribed and claimed and the equivalents thereof.

In the drawings, Fig. tive view of a cutting our improvement.

Fig. 2 is an enlarged sectional detail on the line 22 of Fig. 1, showingthe arrangement of clamping and adjusting devices as applied to one endof the stationary knife.

Fig. 3 is a part sectional diagrammatic detail of a knife, showing thesidewise clamping device and the tapered slot in the casing.

In the drawings, 1 indicates the usual cas- 1 is a front perspecmachmeembodying Cir ' adjusting wall 19 of casing ing with the inlet hopper 2at one side and the outlet spout 3 at the opposite side. Re volvablymounted in the casing 1 is a cylindrical drum 4: carrying on itsperiphery the usual cutting knives 5.

6, 6 designate the stationary kniveswhich extend parallel to the axis ofthe drum 4: and are spaced around the lower part of the periphery of thedrum and casing and between the inlet hopper and the outlet spout 3, asshown in Fig. 1. J i

To provide quick and accurate adjusting means whereby the-stationarycutting edges of the cutting knives 6 may be adjusted in properrelationto. the drum knives 5, we

provide on the casing 1 a pair of lugs T, 7, between which is aknife-receiving slot 8, in which the stationary knife 6 is received bybeing inserted endwise from the side of the machine as previouslydescribed. Each of the lugs 7, 7V is tapped to receive an adjusting stopor bolt 10 with a set nut 11 or equivalent locking means, the heads ofthe adjustable stops 10 adapted to take against the front and rear edgesof the knives 6, 6 respectively. The front or cutting edge is gauged bysetting the inner adjusting bolts, and the knives are clamped againstoutward displacement by the outer set of adjusting bolts. 6 J

A bar 12 spans the space between the lugs 7, 7, its ends being removablyfastened by bolts 13, or otherwise, to the lugs.

In the middle of the length of bar 12 is an bolt 14: having a set nut15, the inner end of this adjusting bolt adapted to engage the end ofthe knife 6, there being one such bolt at each side of the machine. Theknife is readily clamped against endwise movement, and the bolts 14 arelocked, by means of the set nuts 15.

Thus, by means of the bolts 10 and 1 1, the stationary knives can beeasily and quickly clamped in their exact adjusted positions withrespect to the knives of the drum.

Referring now to Fig. 3, itwill be seen that the slot 8 1n the side wallof the casing 1 is made considerably wider than the thickness of theknife at that part farthest from the axisof the drum, and that a setbolt 16, threaded through a lug 17 on the casin is provided to clamp thestationary knife 6 sidewise against the wall 18 ofcasin r 1. The workingedge of the knife is backed by the 1, to resist the cutting stress,which is applied against the knife in the direction of the arrow. Thus,when the bolt 16 is loosened,the knife is immediately released fromwalls 18 and 19 ready to drop .to the bottom of the slot 8 when theouter adjusting bolts 10 are loosened, and one of the bars 12 isremoved. The knife may then be taken out of the machine, ground ordressed and returned to its correct position without the employment ofskilled labor and without the necessity of accurately regauging thecutting edge of the knife with respect to the drum knives.

By the means above described we have produced a simple and relativelyinexpensive knife-adjusting means for cutting and shredding machines:and the like, all of the adjusting parts beingv external to the machineand conveniently located soasto be accessible without removing part ofthe easlIl i J a d lxtremely accurate adjustment can .be easily effectedwithout the necessity of taking accurate clearance measurements, Ibecause .the setting of the inner setof stopslO determines the workingposition of the cutting edges of the stationary knives.

The stationary knives can moved by simply withdrawing them sidewisefromthe casing and as easily replaced.

Having thus described our invention, what be easily re- I we claim anddesire to secure .by Letters Patent is: 1 I

1. In a cutting machine including a revolvable cylindricalknife-carrying drum, a

knives removably casing and stationary.

mounted therein, saidcasing formed with openings in the end wallsthereof, the ends of said stationary knives projecting through saidopenings and outside of said walls, lugs on said walls adjacentsaid-openings,ad-

justable stops on said lugs adapted to engage .1

respectively the inner said stationary knives,

cured to said lugs and spanning said open ings, and an adjustable-stopcarried by said:

against theyend, of

bar and adapted to abut said stationary knife.

and outer edges of a bar. removably se- 2. In a cutting machineincluding arevolvable cylindricalknife-carrying drum, a casing andstationary knives removabliy mounted therein, said casing formed withopenings in the end walls thereof, the ends of said knives projectingthrough said;open-' ings and outside of said-walls, adjustable stops onsaid walls ends and the innerand outer, edges 'of said stationaryknives, and a clamping boltfcaradapted to engage the ried by said walland adapted to abut against,

the side of said'stationary'knife to force the knife against the wall ofsaid opening. 11 I In testimony whereof, we affix our signatures.

. PHILIP S. MITTS.

WILLIAM J. INSTON.

